[app-sk] Set a min-height for the aside.
[app-sk] Set a min-height for the aside.

Also change icon colors in aside.

Change-Id: I830567a9683115eb3fdaed784676eb7cd677f278
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/501161
Reviewed-by: Ravi Mistry <9fa2e7438b8cb730f96b74865492597170561628@google.com>
Commit-Queue: Joe Gregorio <b9cf2471ff6d33504cafe8e6f356b732b2cadced@google.com>

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot